Radio Jove Question
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kb3puw
Oct 20, 2025, 5:40:54 PM (12 days ago) Oct 20
to Society of Amateur Radio Astronomers
Listening to the discussion about Radio Jove at the Drake's lounge I figured I would try to see if I could pick up anything with my Ham antenna. The antenna is an inverted V for 20 meters (14MHz), but I was easily able, with my antenna tuner, to get it to tune to 24MHz. I feed it into my Nooelec SDR V5 with the gain fixed (i.e. auto-gain off) and did some short recordings. The first thing I found was to stay far away from the CBers between 25 and 29MHz. I made a recording at about 4PM in central Texas. Jupiter is below the horizon so I guess if I am picking up anything it would be related to the Sun. I have attached a waterfall taken over about 10 minutes in a frequency range of about 22.5 6o 25.5 MHz. I believe I can see a faint fluctuating pattern in the middle. Is this likely to be a Radio Jove relevant signal or just some non-specific noise?
Dave Typinski
Oct 20, 2025, 11:38:24 PM (12 days ago) Oct 20
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Hard to say what that is. What date & exact time UTC was that observation made?
We can then compare it with what we observed here in Florida.
Here are some examples of emission we see in the HF band:
https://www.aj4co.org/Publications/The%20HF%20Spectrogram,%20Typinski%20%282017%29%20Slides%20and%20Notes.pdf
Hope that helps!
--
Dave, AJ4CO
> PossibleJoveRecord.jpg
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We can then compare it with what we observed here in Florida.
Here are some examples of emission we see in the HF band:
https://www.aj4co.org/Publications/The%20HF%20Spectrogram,%20Typinski%20%282017%29%20Slides%20and%20Notes.pdf
Hope that helps!
--
Dave, AJ4CO
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kb3puw
Oct 21, 2025, 10:42:57 AM (11 days ago) Oct 21
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The capture was at Mon 20 Oct 2025 04∶13∶48 PM CDT which I believe is 9:13:48 UTC
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Dave Typinski
Oct 21, 2025, 10:28:29 PM (11 days ago) Oct 21
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We observed a Type III solar radio
burst at 1909 UTC on the 20th. Could be what you observed; hard
to say for sure without timestamps.
In the spectrogram below, Time UTC is on the horizontal and freq in MHz is on the vertical.
--
Dave
In the spectrogram below, Time UTC is on the horizontal and freq in MHz is on the vertical.
--
Dave
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kb3puw
Oct 22, 2025, 2:34:54 PM (10 days ago) Oct 22
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Thanks, I will keep looking. I see these little blocks in your data. I assume they are the digital burst transmissions that I see a lot of in this frequency band (they are quite recognizable if you demodulate them as AM)?
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Dave Typinski
Oct 22, 2025, 11:36:12 PM (10 days ago) Oct 22
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Those look like HF radar to me.
Normally they hop all over the place frequency-wise, but that
operator seemed to have a fetish for 26.5 MHz.
I'm thinking of the stuff that sounds like this: https://radiojove.gsfc.nasa.gov/library/multimedia/audio/rfi/hfradar1.wav
--
Dave
I'm thinking of the stuff that sounds like this: https://radiojove.gsfc.nasa.gov/library/multimedia/audio/rfi/hfradar1.wav
--
Dave
To view this discussion visit https://groups.google.com/d/msgid/sara-list/CAB-X21MvRZWrzectQHdYFtW8hoJY_eTZpp%2BP0%2BhdRH6jBxJZ8A%40mail.gmail.com.
Lester Veenstra
Oct 24, 2025, 6:47:16 AM (8 days ago) Oct 24
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CW Chirp ionosphere radar
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
452 Stable Ln
Keyser WV 26726 USA
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Dave Typinski
Oct 24, 2025, 11:11:31 PM (8 days ago) Oct 24
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I thought riometers/sounders used FMCW emission, slewing in a quasi-linear
fashion from 2 or 3 MHz up to about 20 or 30 MHz at around 80 to 100 kHz/s or
so. Are there ionospheric chirp sounders that emit for several seconds at a
time centered on the same freq as shown in the spectrogram at 26.5 MHz?
--
Dave
On 10/23/25 10:42, 'Lester Veenstra' via Society of Amateur Radio Astronomers wrote:
> CW Chirp ionosphere radar
>
> Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
>
> les...@veenstras.com <mailto:les...@veenstras.com>
> Of *Dave Typinski
> *Sent:* Wednesday, October 22, 2025 11:36 PM
> *To:* sara...@googlegroups.com
> *Subject:* Re: [SARA] Radio Jove Question
> sara...@googlegroups.com <mailto:sara...@googlegroups.com>
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fashion from 2 or 3 MHz up to about 20 or 30 MHz at around 80 to 100 kHz/s or
so. Are there ionospheric chirp sounders that emit for several seconds at a
time centered on the same freq as shown in the spectrogram at 26.5 MHz?
--
Dave
On 10/23/25 10:42, 'Lester Veenstra' via Society of Amateur Radio Astronomers wrote:
> CW Chirp ionosphere radar
>
> Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
>
>
> 452 Stable Ln
>
> Keyser WV 26726 USA
>
> GPS: 39.336826 N 78.982287 W (Google)
>
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
> Telephones:
>
> Home: +1-304-289-6057
>
> US cell +1-304-790-9192
>
> Jamaica cell: +1-876-456-8898
>
> *From:*sara...@googlegroups.com [mailto:sara...@googlegroups.com] *On Behalf
> 452 Stable Ln
>
> Keyser WV 26726 USA
>
> GPS: 39.336826 N 78.982287 W (Google)
>
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
> Telephones:
>
> Home: +1-304-289-6057
>
> US cell +1-304-790-9192
>
> Jamaica cell: +1-876-456-8898
>
> Of *Dave Typinski
> *Sent:* Wednesday, October 22, 2025 11:36 PM
> *To:* sara...@googlegroups.com
> *Subject:* Re: [SARA] Radio Jove Question
>
> Those look like HF radar to me. Normally they hop all over the place
> frequency-wise, but that operator seemed to have a fetish for 26.5 MHz.
>
> I'm thinking of the stuff that sounds like this:
> https://radiojove.gsfc.nasa.gov/library/multimedia/audio/rfi/hfradar1.wav
> --
> Dave
>
>
> On 10/22/25 14:34, kb3puw wrote:
>
> Thanks, I will keep looking. I see these little blocks in your data. I
> assume they are the digital burst transmissions that I see a lot of in this
> frequency band (they are quite recognizable if you demodulate them as AM)?
>
> On Tue, Oct 21, 2025 at 9:28 PM Dave Typinski <dav...@typnet.net
> <mailto:dav...@typnet.net>> wrote:
>
> We observed a Type III solar radio burst at 1909 UTC on the 20th. Could
> be what you observed; hard to say for sure without timestamps.
>
> In the spectrogram below, Time UTC is on the horizontal and freq in MHz
> is on the vertical.
> --
> Dave
>
>
>
> Those look like HF radar to me. Normally they hop all over the place
> frequency-wise, but that operator seemed to have a fetish for 26.5 MHz.
>
> I'm thinking of the stuff that sounds like this:
> https://radiojove.gsfc.nasa.gov/library/multimedia/audio/rfi/hfradar1.wav
> --
> Dave
>
>
> On 10/22/25 14:34, kb3puw wrote:
>
> Thanks, I will keep looking. I see these little blocks in your data. I
> assume they are the digital burst transmissions that I see a lot of in this
> frequency band (they are quite recognizable if you demodulate them as AM)?
>
> On Tue, Oct 21, 2025 at 9:28 PM Dave Typinski <dav...@typnet.net
> <mailto:dav...@typnet.net>> wrote:
>
> We observed a Type III solar radio burst at 1909 UTC on the 20th. Could
> be what you observed; hard to say for sure without timestamps.
>
> In the spectrogram below, Time UTC is on the horizontal and freq in MHz
> is on the vertical.
> --
> Dave
>
>
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Lester Veenstra
Oct 25, 2025, 11:38:14 AM (7 days ago) Oct 25
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FMCW emission is CW Chirp ionosphere radar
Nothing quasi about them very linear time/frequency slope (rate) and precise start times for receiver synchronization.
Newer types use linear frequency hopping of complex PSK waveforn. The bright lights in this area are from Lowell Tech.
https://digisonde.com/digisonde.html
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Nothing quasi about them very linear time/frequency slope (rate) and precise start times for receiver synchronization.
Newer types use linear frequency hopping of complex PSK waveforn. The bright lights in this area are from Lowell Tech.
https://digisonde.com/digisonde.html
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
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From: sara...@googlegroups.com [mailto:sara...@googlegroups.com] On Behalf Of Dave Typinski
From: sara...@googlegroups.com [mailto:sara...@googlegroups.com] On Behalf Of Dave Typinski
To view this discussion visit https://groups.google.com/d/msgid/sara-list/68FC3FDA.6070401%40typnet.net.
Don Latham
Oct 25, 2025, 12:22:48 PM (7 days ago) Oct 25
to sara
I dimly remembered seeing something similar it's "High Frequency (HF) radar is a technology used to measure sea surface currents and wave parameters in coastal areas. It operates by sending radio waves that bounce off the ocean surface, allowing for the calculation of wave height, direction, and speed. This method is effective for real-time monitoring of coastal conditions." I was seeing the pulses from near Seattle in Western Montana.
Don
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Don Latham
PO Box 404,
Frenchtown, MT, 59846
406-626-4304
Don
To view this discussion visit https://groups.google.com/d/msgid/sara-list/68FC3FDA.6070401%40typnet.net.
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Don Latham
PO Box 404,
Frenchtown, MT, 59846
406-626-4304
Whitham Reeve
Oct 28, 2025, 1:39:28 PM (4 days ago) Oct 28
to Society of Amateur Radio Astronomers
Hi Don - I think you're referring to CODAR (Coastal Ocean Dynamics Applications Radar). There are a few stations along the western coast of Alaska that operate during summer and also in Hawaii and along the coast of the lower-48 states.
There also have been HAARP experiments that involve ocean wave scattering.
Whit
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